The VAG EKN® Butterfly Valve uses nickel-chromium alloy (ratio 71:19): The property of chromium is that at high temperatures, it has a high affinity to bond with carbon
The Kv value is the volume flow of a medium per time unit with a pressure drop of 1 bar at a specific temperature
Check valves are opened by the medium flowing through; depending on the design of the disk, the valve opens fully at different flow velocities:
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